71694566656 has 72 divisors (see below), whose sum is σ = 149712240384. Its totient is φ = 34201221120.

The previous prime is 71694566609. The next prime is 71694566717. The reversal of 71694566656 is 65666549617.

It is a super-2 number, since 2×71694566656² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71694566594 and 71694566603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2322201 + ... + 2352871.

It is an arithmetic number, because the mean of its divisors is an integer number (2079336672).

Almost surely, 2^71694566656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71694566656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74856120192).

71694566656 is an abundant number, since it is smaller than the sum of its proper divisors (78017673728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71694566656 is a wasteful number, since it uses less digits than its factorization.

71694566656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31107 (or 31093 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 61.

The spelling of 71694566656 in words is "seventy-one billion, six hundred ninety-four million, five hundred sixty-six thousand, six hundred fifty-six".